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Two children who waltzed into a live TV interview about a very serious matter of world affairs became a viral video sensation Friday.

The precocious pair walked into a BBC interview with Pusan National University professor Robert Kelly, an expert on Korea, during a discussion on the ramifications of the ouster of South Korean President Park Geun-hye. Video the BBC posted on Twitter had more than 6,000 retweets and 7,500 favorites after about four hours, and other posts with the video had tens of thousands more.

First, a little girl in glasses and a yellow sweater opened the door to the office where Kelly was speaking and sauntered up to him. It was his daughter, according to the BBC's write-up of the high jinx.

"I think one of your children has just walked in," presenter James Menendez said.

Ya Lun and Xi Lun, the only two giant panda twins in the US, have reached a new milestone as they now enjoy all-day play in their dayroom habitat, the Atlanta Zoo said on Thursday. The twin girls, who turned 6 months old in on March 6, now weigh around 9.5 kilograms (Ya Lun) and 10 kilograms (Xi Lun).

The mother, Lun Lun, first brought her offspring into their dayroom habitat in December 2016, since then "they have been spending more and more time in the habitat", the zoo said.

According to the Atlanta Zoo, the pair are "very able runners and climbers".

The International Union for the Conservation of Nature (IUCN) upgraded the giant panda's status from "endangered" to "vulnerable" in September 2016, but the species remains heavily reliant on conservation programs.

Fewer than 1,900 giant pandas are estimated to remain in the wild in China's Sichuan, Shaanxi and Gansu provinces, where they face continuing threats from habitat fragmentation and habitat loss as a result of deforestation and other human activities.

More than 1,200 of China's remaining wild giant pandas live inside nature reserves, eight of which are supported by Zoo Atlanta.

(Published Friday, March 10, 2017)

An exuberant baby in a baby walker next entered the scene. Then, in a slapstick moment worthy of Buster Keaton, a woman burst through the door after the kids. She hastily rounded them up and pulled them out of the room, with a few books knocked over in the process.

NBC has reached out to Kelly for comment. He hasn't yet addressed the issue on Twitter, except to tweet his thanks to someone who pointed out he's "a damn good Korea analyst."

In other kids-do-the-darndest-thing news Friday, a different video went viral for showing a girl fly through the air after the door she was opening at her Ohio home was caught by powerful winds. (She was okay.)